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7 UNITED STATES PATENT OFFICE.

JACOB J. STORER, OF NEW YORK, N. Y.

MACHINE FOR PULVERIZING ORES, 80C.-

SPECIFICATION forming part of Letters Patent No. 254,403, dated February 28, 1882. Application filed May 17, 1881. (No model.)

To all whom it may concern:

Be it known that I, JACOB J. STORER, of the city, county, and State of New York, have invented an Improvement in Machines for Pulverizing Ores and other Substances, of which the following is a specification.

This invention is designed as an improvement on the ore-pulverizer for which Letters Patent No.36,580, of September 30, 1862, No. 44,990, of November 8, 1864, and No. 50,975, of November 14., 1865, were issued to Jacob J. Storer and James D. Whelpley, and its object is to increase the capacity of the pulverizers for the production of pulverized material, to provide devices for regulating the quantity and quality of their yield, to regulate the amount of air passing through, and to increase the durability of the machine.

Figure 1 is a longitudinal sectional elevation of the improved pulverizer. Fig. 2 is a sectional end elevation of the same on line a: 00, Fig. 1. Fig. 3 is an elevation of ribs and removable diaphragm.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the cylinder, 7

preferably constructed of cast-iron, and made in two longitudinal sections, hinged together, as shown at c, and provided with flanges, as shown at b, between which it is designed to lay strips of felt to make a dust-tightjoint.

B represents the bed-plate of the cylinder A, having at each end a standard, 0, supportingajournal-box, B. A shaft, (J, having a driving-pulley, O, is extended longitudinally and centrally through the cylinderA, and has its bearings in the boxes B, that end of the shaft at the feed end of the cylinder being preferably provided with a thrust-bearing, as shown at d, to prevent end motion of said shaft 0 from the continuous movement ofv the air and pulverized material toward the exit end of said cylinder. At the feed end of said cylinder A is a large axial opening,f, over which is fitted the feed-hopper D, through which the shaft 0 passes, and on the top of this hopper D are sliding plates D, to regulate the size of the opening in its top corresponding with the quantity of air and substance to he pulverized that is to be'fed into the cylinder A.

Below the axial openingfinthc'l'eed end of the cylinder A is a crescent-shaped opening, g,

charge opening, is.

covered by a register, g, through which, when desired, an additional quantity of air to that entering through the feed-hopper D may be admitted to pass through the cylinder A with the pulverized material, this greater volume of air having the effect of more quickly moving the pulverized material through the cylinder A, and thereby increasing the amount yielded in a given time, though at the expense of the quality thereof, as the full volume of air will carry the particles from the cylinder before the major part of them is reduced to impalpable powder. In some instances, however, these conditions are most desirable. The openinggmay aswell be abdve the openingf. At the opposite or exit end of the cylinder A a crescent-shaped opening, h, controlled by a register, h, whereby air, when desired, is admitted into the exit-chamber E of the'cylinder A, which exit-chamber E has a peripheral disopening h does not pass through the cylinder A, hence does notincrease the delivery thereof, but on the contrary operates, as it were, as a counter-current in the exit-chamber E, and thereby diminishes the force and volume of the air passing through said cylinder A, and consequently causes the material to be pulverized to be retained longer under the action of the paddles, and thereby become further commiunted. This opening it is of especial use when it is desired to pulverize coal and introduce it directly from the pulverizer into a furnace or fire-box, as by means of it the coal is retained longer in the machine for finer pulverization, and all the air required for the complete combustion of the coal is furnished.

The cylinder A is interiorly divided into several chambers--in this instance four, E F G H-'-by ribs or diaphragms set at equal distances apart. Beginning at the feed end of the said cylinder A, the semi-annular ribs I, separating the pulverizing-chambers HG, are designed to be about three or fourinches deep in a cylinder of from twenty-four to thirty inches in internal diameter, and are secured in place on the inside of the cylinder A byscrewbolts l, tapped into them from the out-side'of said cylinder A. These ri'bs I, it will be seen, are removable. To the inner edges of these ribs I semi-annular diaphragms I, of any desired depth, may be secured by screw-boltsm,

Air admitted through this or other convenient device, so as-to reduce the axial opening a about the shaft 0 to any desired extent.

The ribs K, that separate the pulverizingchambers Gr I are cast with and as part of the cylinder A, and to these ribs K diaphragms I may be secured, if desired. Between the pulverizing-chamber F and the exit-chamber E are the diaphragms L, that are a part of the cylinderA. These diaphragms L are designed to be about eight inches deep in a cylinder of twenty -four inches in internal diameter and about ten inches deep in a cylinder of thirty inches diameter, so that an axial opening, 0, of from eight to ten inches in diameter shall be made about the shaft 0.

The partitions between the chambers E F G H may all consist of removable ribs I, provided, if necessary, with diaphragms I, or of permanent ribs K, provided, it desirable, with diaphragms I, or of complete fixed diaphragms L.

In-order to prevent wear upon the interior of the cylinder A and to insure its perfect smoothness internally, it is lined with plates M, of wrought-iron or steel, held in place by countersunk bolts 19, passed through them and the cylinder-shell, and having nuts 12 on their outer ends, as shown. These linings M also insure the cylinder A against fracture from bolts, nuts, pick-points, &c., that often areintroduced into the pulverizer with ore, bones, &c., that are to be pulverized.

Secured on the shaft 0 in each chamber E F G H is a disk or hub, N, to the face of which are secured by bolts and nuts q q radiating arms 0. 0n the end of each arm 0 is welded or otherwise secured a palm or cross plate, 0, forming part of said arm 0.

In a pulverizer of from eighteen to thirty inches diameter, or larger, each hub N carries fromsix to eight of said arms 0. On each palm or plate 0 within the pulverizing-chambers F G H are firmly fastened by bolts and nuts 8 s rectangular pulverizing-paddles- P, that are designed to be, for pulverizers above twenty-fourinchesin diameter, about sixinches long, four inches wide, and an inch thick, and

to have their outer edges at a distance of from three-quarters of an inch to two inches from the lining or inner circumference of the cylinder A.

In the exit-chamber E the arms 0 have secured upon their palms O broader and thinner plates or fans S, of steel or iron, preferably bent at a single angleat their inner edges, as shown in Fig. 2. These fans S operate to draw the air into and from all the air-entrances of the cylinder A and the pulverized material through said cylinder A into the exit'chamber -E, and to thence expel the pulverized material on the current of air through the peripheral exit 7r.

' Attached to the cylinder A or its bed-plate B is the hopper T for containing and delivering the materials to be pulverized into the feedhopper D. This hopper T is provided with revolving auger T for delivering the material, and is supported on a standard, T This hopper T audits several parts do not constitutea part of my present invention, as a patent-No. 102,997-was issued for it to James D. Whelpley and Jacob J. Storer, May 10, 1870.

The operation of the pulverizer is as follows: When the shaft 0 is in motion, so that the paddles and fans thereto attached have a circumferential speed of about two miles aminute, the material to be pulverized is fed into the hopper D and air is admitted through the various air-openings as required. The rapid motion of the paddles forces the air and material to be reduced to the inner circumference of the cylinder in the chamber H. Behind the paddles, by their rapid motion, vortices of air are formed, and in these vortices the particles of ore or other substances are caught and violently rubbed against each other, so that they are reduced into powder by their own attrition. When these particles are reduced to such a degree that their gravity is overcome by the current of air passing through the pulverizer they are drawn by said current, which is generated by the fans in the exit-ch amber E, into the next pulverizingchamber, G, where they are thrown by the centrifugal action of the operating parts of the machine under the influence of the paddles in this chamber G, to be further comminuted by their own attrition. Thence said comminuted particles are drawn into the succeedin g pnlverizin g-ch amber, to be further reduced, and thence into the exit-chamber E, then at once expelled through the peripheral exit 70.

By reducing by diaphragms the axial openings about the shaft 0 to diameters of four or five inches in machines of twenty-four inches and upward in diameter, only floated powders will be produced by the machine, and by removing the ribs and diaphragms the major part of the material passing through the machine will be so coarse as to pass only through a screen of forty meshes or less to the linear inch, and between these extremes of reduction any required grades of fineness may be produced by properly adjusting the diaphragms and the air-openings.

I do not broadly claim a pulverizer having an axial exhaust from the pulverizing-chamber, nor a pulverizer having a peripheral exhaust from the pulverizing-chamber; nor do I broadly claim means for admitting the outer air into the pnlverizing-chamber, nor a removable partition between the pulverizing and discharge chambers.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A pulverizer constructed substantially as herein shown and described, consisting of a fixed horizontal cylinder, in combination with two or more pulverizing chambers located therein and separated by annular ribs, and a separate discharge or fan chamber communi- F verizing-chambers located therein and formed 1 by ribs and removable diaphragms, and a discharge-chamber communicating axially therewith and having a peripheral opening and containing fans of greater area than the pulveri 5 izingpaddles, substantially as shown and described.

3. In a pulverizer, substantially as herein shown and described, the combination, with the ribs I, of the annular diaphragms I, sub- 20 stantially as shown and described.

JACOB J. STORERf Witnesses:

JAMES T. GRAHAM, C. SEDGWIoK. 

